Polishing or grinding roll



Dec. 6, 1938. H. H. GILES POLISHING OR GRINDING ROLL Filed Dec. 22 1936 FIE-1.1.-

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Patented 1938 mush-ms PATENT OFFICE T 'romsmnc 0a Gamnmo iimryir. Gus; Lincoln Place, Pa.;

son Gilesfiexecutrin of said Henry H. Giles,

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t Application Iieeember 22, 1936, Serial No. liaise This invention relates to the polishingor grinding of sheetstoa high degreeof luster; and more particularly to the rolls perform this function.v

It is among the objects of the present invention to provide aroll forpoli shing or grinding operations which does not produce irregularities in. the surface'of the workpiece; and one which does. not require axial oscillation/to avoid this 111-:

jurious condition- Another objectds to provide a roll of the class described which is characterized bya maximum depth of resiliency and also. a. practical compressive and elastic surface.

The foregoing: and other objects will be apparent after referring to the drawing, in which:

Figure l isa plan of one form of apparatus of the invention. a

Figure 2 is a side'elevation' of the apparatus of Figure 1.

Figure 3 is an enlarged elevation of a detail.

Figure 4 is a sectional view on the line IV-IV of Figure 3.

Referring more particularly to the drawing, the numeral I designates a table on which is supported a wheeled carriage 4 adapted to travel upon track members 4. Thecarriage 4 is adapt ed to be reciprocated on the table i between stops 2 and 3 by a fluid pressure cylinder 20 having its piston-rod 2i connected to the carriage, as at 22'. Fluid pressure may be admitted to the cylinder 20 at opposite ends for reciprocating the carriage 4 in any well known manner. It will be understood that any other-suitable means for reciprocated under a polishing or grinding belt 6 which is trained about rollers I and 8.

The roller 1 is adapted to be power-driven by any suitable means, such as the speed reducer 8 and motor 24.. The rollers i and Bare journaled in suitable bearings in supports 1 and 8, respectively, which extend upwardly from the table member I.

The carriage 4 is provided along at least one edge with a pivoted clamping jaw, i0 which, by a means of an eccentric or cam ii, is made to engage and disengage one or more tabs 9, which are secured to the sheet 5 as, for instance, by welding. This construction and arrangement enwhich are intended to ables the holding of the sheet 5 against movement on the carriage 4, andpermits its entire surface to be uniformly polished.

wThe pressure rolls 1 may be usedto support and drive a polishing orgrinding belt; as shown at 6, or may be usedas a directcon'tactpolishing or grindingroll, as inboth instances its construction and arrangement allows its novel advantages to function equally well. In either event this pressure roll iiFigure 3) is made up or a plurality of circular sections I! which are'centrally mounted in abuttingrelationship.about. a shaft it, the latter being supported in bearings l3.

'Between each of the sections l2 and also encirplates I! at each end of the assembled roll, the

end plates I 5 being securedto the shaft l3 in any convenient manner.

In order to positively prevent the rotation of the circular sections IZ they, the plates l4, and the end plates i5, may all be keyed to the central shaft l3, as shown at ii".

In order to facilitate readily securing the encl plates IE to the shaft iii, the extreme end circular sections I! are wedge-shaped, as at IE, but are in all other respects identical with the other sections I 2.

Heretofore, polishing or grinding rolls for the purpose described have usually been made up 01' a plurality ofstitched sections, each section of which was usually of circular bufllng cloth of 18- ply canvas. These cloth sections were assembled on a central shaftso that their abuttingsurfaces were at right angles thereto. a

In order to increase the polishing or grinding effect, the roll was forced into closer contact with the work-piece by decreasing the space therebetween. The pressure thus increased would cause the abutting cloth sections to spread or shift laterally, leaving gaps therebetween which in turn left unpolished or unground areas on the flat work-piece. These unpolished or unground areas appear as longitudinal streaks.

Thus, such prior construction only enables contact pressure to a degree much less than desired, and the roll itself has a minimum depth of reor marked.

88 elimination of marking in marked contrast is my invention, whereby I obtain not only the maximum depth of resiliency under any desired contact pressure, but also a practical compressive and elastic surface. Regardless of the contact pressure, which can be raised to any degree desired, there is no shifting or spreading of the circular sections and therefore no gaps to cause unpolished or unground areas or streaks. This is accomplished by cutting the sections in such manner that their abutting surfaces are inclined to the shaft on which they are assembled. Such an angle of inclination can be approximately 15 degrees, but this may, if desired, be varied, as the greater the angle of inclination the greater the possible pressure which may be utilized. Such sections so inclined and assembled are preferably of a solid section of a somewhat elastic material, such as cork. They can also be made of hard rubber, but in any case it is of prime importance that they be sufficiently resilient to provide a good compressive surface together with the maximum depth of resiliency.

The inclined abutting sections present at no time any permanent line contact which eliminates the necessity of purposely oscillating the central shaft as heretofore necessary. Aroll made up of such ,circularsections can either support an endless abrasive belt or its outer surface be supplied with an abradant surface and used directly against the work-piece. In either case it presents an' abrading surface which will readily yield to irregularities on the surface of the work-piece without. permanently aflecting the. surface or hardness of the roll.

the roll not only increases its life but also allows changing from narrower to wider widths of work-piece without redressing or resurfacing the roll.

While I have shown and described one specific embodiment of my invention, I do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of my invention, as defined in the following claim.

I claim:

A cylindrical roll for polishing or grinding substantially flat surfaces comprising a rotatable shaft, a plurality of flat-sided abutting resilient circular. sections assembled on said shaft, the abutting surfaces of said fiat-sided sections being inclined at an angle to a line which is perpendicular with the axis of the roll, a wedge-shaped retaining section at each end of said assembled flat-sided sections, each of said wedge-shaped retaining sections having an angularly inclined inner surface for abutting the outer surfaces of the'fiat-sided sections at the ends the assembiy thereof, the diameter of said wedge-shaped retaining sections being substantially that of the fiatsided sections at the ends of the assembly which they abut, the outer surface of said wedgeshaped retaining sections being substantially perpendicular to the line of contact of the roll, a relatively thin plate of' smaller diameter disposed on either side of each of said fiat-sided sections, and means for securing said fiat-sided sections, said wedge-shaped retaining sections, and said plates to said rotatable shaft.

HENRY H. GILES 

